304 results about "High frequency modulation" patented technology

Structures and methods for three-dimensional image sensing using high frequency modulation includes CMOS-implementable sensor structures using differential charge transfer, including such sensors enabling rapid horizontal and slower vertical dimension local charge collection. Wavelength response of such sensors can be altered dynamically by varying gate potentials. Methods for producing such sensor structures on conventional CMOS fabrication facilities include use of “rich” instructions to command the fabrication process to optimize image sensor rather than digital or analog ICs. One detector structure has closely spaced-apart, elongated finger-like structures that rapidly collect charge in the spaced-apart direction and then move collected charge less rapidly in the elongated direction. Detector response is substantially independent of the collection rate in the elongated direction.

A power amplifier (10) comprises: an A / D converter (11) for converting, to a time discrete signal, an envelope signal included in a high-frequency modulated signal and including only an amplitude modulated component of the high-frequency modulated signal; a switching amplifier (12) for amplifying the output signal of the A / D converter (11); a low-pass filter (13) for removing high frequency noise from the output signal of the switching amplifier (12); a plurality of high-frequency power amplifiers (15-1 to 15-n) for receiving the output signal of the low-pass filter (13) as a power supply and for amplifying a carrier signal included in the high-frequency modulated signal; and a power controller (14) for adjusting the average power of the output signal of the power amplifier (10) by controlling the total gains of the plurality of high-frequency power amplifiers (15-1 to 15-n).

Selective high-frequency spinal chord modulation for inhibiting pain with reduced side affects and associated systems and methods are disclosed. In particular embodiments, high-frequency modulation in the range of from about 1.5 KHz to about 50 KHz may be applied to the patient's spinal chord region to address low back pain without creating unwanted sensory and / or motor side affects. In other embodiments, modulation in accordance with similar parameters can be applied to other spinal or peripheral locations to address other indications.

A printed circuit board motor is disclosed. The motor comprises a rotor plate embedded with magnets, an axle, and a printed circuit board stator. The printed circuit board comprises two conductors printed on the same surface or on opposite surfaces of the printed circuit board The two conductors produce alternating “square wave” patterns. The printed circuit board circuitry causes the direction of the current flow to reverse at intervals. The rotor rotates in response to the current flow in the stator. The rotation rate can be accurately controlled. The torque and average current consumption can be controlled by “chopping” the current with high frequency modulation whose duty cycle is proportional to the torque and average current consumption which will prolong the battery life of the motor.

The invention discloses an optical fiber distributed multi-point methane real-time monitor based on the light wave modulation spectrometry and the monitoring method, a semiconductor DFB laser, an optical fiber splitter, a gas calibration pond, a laser control circuit board, a signal generative circuit board, a lock-in amplified board, a data acquisition card, a control module, a multi-channel analog signal selection switch and a driving circuit are arranged in the main case of the monitor, the main case is connected with miniature optical sensors in various underground detection optical path through dingle mode fibers. The wavelength modulation of a gas laser absorption spectrum is realized by a low frequency scanning signal and a high frequency modulation signal generated by a signal generative circuit. The laser wavelength shift is carried out adaptive adjustment by the built-in gas calibration pond so as to realize the locking of a methane absorption line. The distributed multi-point methane concentration monitoring in the underground coal mine is realized by the switching of the multi-channel analog signal selection switch.

The invention relates to a gas concentration on-line measurement method based on laser absorption spectrum, belonging to the technical field of the tunable laser diode absorption spectrum. The Beer-Lambert principle is subjected to second-order Taylor approximation, the gas concentration is determined based on the ratio of absorption signal second harmonic to background signal first harmonic without calibration experiment. During the measurement process, a laser is subjected to high-frequency modulation on the spectrum line center frequency, and the acquired signal is subjected to discrete Fourier transform (DFT) to obtain each harmonic signal. The gas measurement precision is increased, the wavelength modulation technology is applied at the strong absorption condition, and the application range of the tunable diode laser absorption spectroscopy (TDLAS) is expanded. In the experiment, a calibration and application phase-lock technique applied on the laser is omitted, the measurement process and the measurement system are simplified and the wide application of the TDLAS technique is facilitated.

Optical sensor measurement methods that convert a wavelength change in an optical sensor to a measurable optical intensity change, which can be calibrated and used to measure optical wavelength change and environmental changes such as temperature or strain which affect sensor wavelength. The current invention makes use of tunable fiber Fabry-Perot filters as the wavelength selective elements for the wavelength to optical intensity conversion. The invention provides high measurement sensitivities to small amplitude, high frequency modulations to the fiber sensor center wavelength, accommodates for system drift from thermal or other perturbations, and enables either frequency mode or time varying resolution of sensor modulation events. Selection of proper Fabry-Perot optics allow for measurement optimization of either high sensitivity or high strain measurement range.

The invention provides a multifunctional power electric transformer. The multifunctional power electric transformer is divided into three levels, namely an input level, an isolation level and an output level, wherein the input level adopts an H bridge cascaded topological structure to meet the requirements on different input voltage levels; the isolation level adopts a mode of parallel connection of a plurality of high-frequency transformers, the DC / AC high-frequency modulation and the AC / DC high-frequency modulation in an isolation link both adopt a single-phase fully controlled half-bridge structure to save switch parts; the output level consists of one or more three-phase voltage source convertors which are connected in parallel, so that the multi-output can be realized according to the need of a load; and the convertors of the output level are also connected with an LC wave filter to improve the waveform quality of the voltage and the current. The whole device fully adopts technically mature power parts, and each layer cascaded with the input level and the corresponding isolation level can be combined into a convertor, thereby facilitating the design and the production of the convertors. Besides simple functions of voltage conversion and isolation and energy transfer, which can be realized by the conventional transformer, the multifunctional power electric transformer can also realize other novel functions meeting the needs of a power system.

A half bridge gate driving circuit for providing gate driving circuits in a bi-hecto celcius (200 degrees celcius) operating environment having multiple functions including combinations of multiple level logic inputs, noise immunity, fault protection, overlap protection, pulse modulation, high-frequency modulation with transformer based isolation, high-frequency demodulation back to pulse width modulation, deadtime generator, level shifter for high side transistor, overcurrent protection, and undervoltage lockout.

The present invention relates to the technical field of laser spectrum detection and gas detection, and in particular relates to a two quantum cascade laser spectrum-based multicomponent gas simultaneous detection device and method. An arbitrary waveform function generator outputs a periodic signal which only superposes high-frequency modulation signals in any half period to be used as a laser current signal, a room temperature continuous mode mid-infrared quantum cascade laser is driven by a current control unit, the laser emits a laser signal, the laser signal passes sequentially through a focusing collimating three-dimensional adjustment system, a first mirror, a sample absorption pool and a off-axis parabolic mirror to be reflected to a first detector, the first detector passes the laser signal through a data acquisition unit to convert into an electrical signal and transmit to a computer, and information of the gas to be measured can be obtained by analysis and processing of the electrical signal by the computer. The devices simultaneously utilizes two spectrums for gas detection, and has the advantages of high detection sensitivity, high detection accuracy, no need of external standard gas calibration, simple optical path adjustment, fast response, and stability, and the like.

Selective high-frequency spinal cord modulation for inhibiting pain with reduced side effects and associated systems and methods are disclosed. In particular embodiments, high-frequency modulation in the range of from about 1.5 KHz to about 50 KHz may be applied to the patient's spinal cord region to address low back pain without creating unwanted sensory and / or motor side effects. In other embodiments, modulation in accordance with similar parameters can be applied to other spinal or peripheral locations to address other indications.

The invention relates to a multicarrier digital satellite broadcasting system and the digital information transmitting method thereof, comprising signal source coder, code modulator, transmitter, satellite, user demodulator and signal source decoder, where the signal source coder encodes analog signal into digital signal, which is transmitted to the code modulator for error control coding, constellation mapping, scrambling, OFDM modulation and signal mark addition to obtain transmitted frame group; the transmitted frame group is processed by time gap multiplexing, low-pass filtering, carrier high frequency modulation and synthesizing of various frequency data and finally transmitted to the transmitter; the transmitter transmits the high frequency signal to the satellite and is received by the user demodulator by satellite broadcast; the user demodulator detects signal and demodulates the signal into data stream and transmits the data stream to the signal source decoder to be decoded into analog signal to be outputted to terminals. And it implements flexible multiplexing of multicast services and improves system flexibility.

An integrated circuit comprises frequency generation circuitry for controlling a frequency source for use in an automotive radar system. The frequency generation circuitry comprises low-path modulation circuitry arranged to generate a first, low-path control signal for providing lower frequency modulation of the frequency source, the low-path modulation circuitry comprising a Phase Locked Loop (PLL) arranged to generate the low-path control signal for controlling the frequency source and a fractional-N divider located within a feedback loop of the PLL, and frequency pattern control module operably coupled to the fractional-N divider and arranged to control the fractional-N divider, by way of at least a first, lower frequency pattern control signal. The frequency generation circuitry further comprises high-path modulation circuitry arranged to generate a second, high-path control signal for providing higher frequency modulation of the frequency source.

Structures and methods for three-dimensional image sensing using high frequency modulation includes CMOS-implementable sensor structures using differential charge transfer, including such sensors enabling rapid horizontal and slower vertical dimension local charge collection. Wavelength response of such sensors can be altered dynamically by varying gate potentials. Methods for producing such sensor structures on conventional CMOS fabrication facilities include use of “rich” instructions to command the fabrication process to optimize image sensor rather than digital or analog ICs. One detector structure has closely spaced-apart, elongated finger-like structures that rapidly collect charge in the spaced-apart direction and then move collected charge less rapidly in the elongated direction. Detector response is substantially independent of the collection rate in the elongated direction.

The invention belongs to the field of medical equipment, is used for the intensity modulated radiation therapy of tumors and particularly relates to a double-layer multi-blade collimator. The double-layer multi-blade collimator comprises a switching multi-blade collimator on the upper layer and an electric multi-blade collimator on the lower layer; both the switching multi-blade collimator and the electric multi-blade collimator consist of two groups of opposite blades; the front end face of each blade of the switching multi-blade collimator is a straight end face and the rear end of the blade of the switching multi-blade collimator is connected with a micro electromagnetic driving mechanism; each blade of the electric multi-blade collimator is driven by a micro motor; and the blades of the switching multi-blade collimator and the blades of the electric multi-blade collimator move, are laid out in the same direction and have the same numbers. The double-layer multi-blade collimator is applied to a tumor intensity modulated radiation therapy device and has the advantages of simple structure, beam collimation, high working efficiency, high frequency modulation resolution and high safety.

The invention discloses a ranging device based on a laser phase method, and the ranging device provided by the invention comprises a laser emitting and electro-optical modulating module, an internal-external optical path module, and a photoelectric detecting and data processing module, wherein the laser emitting and electro-optical modulating module is used for emitting an infrared laser subjected to high frequency modulation, the internal-external optical path module comprises an internal optical path and an external optical path; the infrared laser is transmitted to the photoelectric detecting and signal processing module respectively through the internal optical path and the external optical path; the photoelectric detecting and signal processing module is used for respectively performing the conversion and frequency-conversion process on the two transmitted optical signals to obtain a phase difference between two optical signals so as to obtain a to-be-measured distance value. Thedevice directly transmits the light emitted by the laser to an integrated electro-optical modulator through an optical fiber; an exit beam is transmitted to the focus point of a range finder emittinglens through the optical fiber so as to greatly simplify the optical path structure; and meanwhile, the modulation frequency of the integrated electro-optical modulator is much higher than the directmodulation frequency of the laser, thereby achieving higher measurement precision.

This invention involves irradiating an optical disk with laser light, pulse-driven by a high-frequency signal from an HF oscillator, and converting the output of a photo-detector that receives laser light reflected from the optical disk into an electronic pulse readout signal using a current amplifier. The pulse readout signal is converted into a temporally continuous readout signal by a peak hold circuit. The invention solves the problems of SNR deterioration of the readout signal and the difficulty of removing the impact of high-frequency modulation accompanying the increase in the readout speed factor in optical disk devices.

An atmospheric visibility measuring system is characterized in that the system can realize full-scale precise measurement of atmospheric visibility. The system adopts a measurement structure with a single light source and double baselines; a light source transmitting terminal and two signal receiving terminals are integrated into a whole body, which reduces the complexity of optical path debugging and measurement electronic system design, reduces requirements for field installation, improves system practicality, and reduces equipment cost. Meanwhile, the laser light source is subject to high frequency modulation, and an optical filter is installed in the front of a detector, which improve the system capability of resisting background light and stray light influence. In the signal sampling part, synchronous demodulation weak signal detection technology is adopted, which improves the measurement precision and measurement range of the system. The atmospheric visibility measuring system of the invention is applicable to industries of meteorological stations, airports, highway, harbours, atmosphere environment monitoring, and the like.

The invention discloses a high-frequency electromagnetic water purification system in the technical field of clean water treatment, which comprises a high-frequency modulation wave generator, a voltage pre-amplifier, a high-frequency power amplifier, an electromagnetic water energy converter, a state parameter monitor, a signal processor and a stabilized power supply. The high-frequency electromagnetic water purification system can effectively prevent and remove scale from the wall of a water pipe, can detect the water flow and electrical conductivity of a circulating water system in real time, and can conduct identification and operation according to the water flow and the electrical conductivity so as to determine the best electromagnetic energy power to be transmitted to the treated water quality; therefore, the effects of high efficiency and energy saving are achieved when the water treatment is implemented.

An integrated data jitter generator for the testing of high speed serial interfaces is provided. A transmit timing generator for use in a transmit data path includes a high frequency clock generator such as a phase-locked loop or a delay-locked loop having an input for receiving an oscillator or reference clock input. A clock modulator receives both an existing low frequency modulation signal and a high frequency modulation signal. A high-speed modulated clock signal is generated to enable jitter testing by a downstream-coupled receiver. Fixed frequencies such as 3, 6, 125, 150, 250, 300, 750, or 1500 MHz are used for the high-speed modulation signal, but any high-speed modulation frequency can be used to generate the desired amount of jitter. Likewise, the amplitude of the high frequency modulation signal can also be varied as desired.

A reading devices suppresses deterioration of the recording marks caused by increasing the output laser power to compensate for a drop in the S / N ratio when reading at a high speed information recorded to a high density recording medium. To read information recorded to an optical data recording medium that is written and read using a laser beam output from a semiconductor laser, the reading method modulates a high frequency current on the drive current of the semiconductor laser to output the laser beam, and changes the light modulation rate according to the selected linear velocity used for reading. The light modulation rate is the ratio Pp / Pave between the peak power Pp and the average read power Pave of the light intensity of the high frequency modulated laser beam.

The invention discloses a handheld laser ranging device, which comprises a laser transmitter, a DDS (Direct Digital Synthesizer) frequency generating module, an I / Q (In-phase / Quadrature) modulation module, an APD (Avalanche Photo Diode) frequency mixing receiving module, a low frequency amplifier module and a microcontroller module, wherein the laser transmitter transmits laser ranging signals to a to-be-measured object; the DDS frequency generating module provides the laser transmitter with high frequency modulation signals; the I / Q modulation module modulates the high frequency modulation signals and outputs the modulated signals; the APD frequency mixing receiving module receives the laser ranging signals that are sent back from the to-be-measured object, the laser ranging signals and the modulated signals are processed through frequency mixing, and low frequency signals with phase differences are output; the low frequency amplifier module converts the low frequency signals to low frequency voltage signals; and in addition, the microcontroller module generates and outputs I / Q signals, receives the low frequency voltage signals, processes the low frequency voltage signals through phase detection, and obtains distance signals of the to-be-measured object so as to output the distance signals. The handheld laser ranging device has the advantages of small size, low power consumption, accurate measurement, high speed and the like, and is especially suitable for the fields such as industrial setting, estate measurement, construction technology, upholstery.

The invention discloses a rubidium atomic microwave clock based on Faraday laser pumping. By using a Faraday external cavity laser technique with wavelength operated on a rubidium atomic transition spectral line, frequency of output laser is homogenized through high frequency modulation and applied to a pumping source of a rubidium atomic microwave clock so as to obtain a rubidium atomic microwaveclock based on Faraday laser pumping, wherein wavelength of laser generated by a Faraday laser unit is capable of highly stably operating on the rubidium atomic transition spectral line and is insensitive to operating current and temperature of a laser tube; the rubidium atomic microwave clock uses Faraday laser as pumping light, the operating mode that a traditional laser pumped rubidium atomicmicrowave clock requires a servo locking circuit system to stabilize the frequency during laser pumping is subverted, the international problems in laser loss of lock related to laser frequency stabilization are thoroughly solved, and long-term continuous reliable operation is available within a lifetime of the laser tube.

The invention relates to a high-speed laser diode driver integrated circuit adopting a negative capacitance neutralizing technology, and belongs to the field of integrated circuits. The high-speed laser diode driver integrated circuit adopting the negative capacitance neutralizing technology aims to enlarge voltage gain -3dB bandwidths of a driver, enhance high-frequency modulation current output capability and improve eye pattern characteristics of output high-frequency current signals under the premise that the power consumption of the driver is not increased. The high-speed laser diode driver integrated circuit adopting the negative capacitance neutralizing technology is formed by m levels of amplifiers in a cascading connection mode, and the m is a natural number larger than or equal to 1. The nth-level amplifier in the m levels of the amplifiers is a controllable gain amplifier adopting the negative capacitance neutralizing technology, the n is smaller than or equal to the m, and the nth-level amplifier comprises a differential amplifier and a source electrode follower. The differential amplifier comprises a controllable current source In1, an NMOS transistor Nn1, an NMOS transistor Nn2, a load resistor Rn1, a load resistor Rn2, a capacitor Cn1 and a capacitor Cn2. The source electrode follower comprises a controllable current source In2, a controllable current source In3, an NMOS transistor Nn3 and an NMOS transistor Nn4.

A base-station amplifier device for use in amplifying at least one channel to be transmitted from a base station is provide to solve deterioration in radio characteristic caused due to variation of peak signal. The base-station amplifier device comprises: amplitude limiting means for amplitude-limiting a base band signal every said channel; high-frequency modulating means for performing a high-frequency modulation on an output from said amplitude limiting means every said channel; adding means for adding outputs from all of said high-frequency modulating means; amplifying means for amplifying an output from said adding means; and amplitude controlling means for controlling said amplitude limiting means based on characteristic of said amplifying means.

The invention discloses a GPS synchronous clock carrier power source, comprising a synchronous clock module, a modulation module, a DC power module, carrier power transmission lines, and N demodulation modules, wherein, the carrier power transmission lines are used for transmitting high-frequency modulation synchronous clock signals; and N is the total number of accessed synchronous measurement and control devices. The GPS synchronous clock carrier power source modulates a synchronous clock signal, such as IPPS pulse per second and UTC time information, output by the synchronous clock module based on a GPS receiver and the DC power into a carrier power with a synchronous clock, and transmits the carrier power with the synchronous clock into various synchronous measurement and control devices in a monitor terminal substation of a power system; the synchronous measurement and control devices obtain high-precision synchronous clock signals and DC power needed in working through the carrier power transmission lines. The GPS synchronous clock carrier power source of the invention can simplify the structure of a field synchronous measurement and control device, leaves out the power module and the GPS receiver, reduces the cost, and can lead the layout of a synchronous measurement and control system in the terminal substation to be more compact, flexible and reasonable.

The invention discloses a light emitting unit, an optical signal detection module, an optical system and a laser radar system. The light emitting unit comprises a light source subunit, a high frequency modulation subunit and a difference frequency subunit; the light source subunit emits an initial light beam; the high frequency modulation subunit modulates the frequency of the initial light beam via a photomixing technology, and emits at least two different frequencies of high frequency emission signals; the difference frequency subunit caries out difference frequency processing on two randomfrequencies of high frequency emission signals, and emits at least one type of low frequency emission signal; and at least one type of high emission signal and at least one type low frequency emissionsignal as detection light signals are emitted by the light emitting unit. Thus, the initial light beam emitted by the light source subunit is modulated via photomixing and difference frequency technologies, time for light beam modulation is shortened, the detection light signals are emitted at a higher speed, and the detection speed of the laser radar system is improved.

The invention discloses a high-frequency distribution transformer, which comprises a three-phase voltage high-frequency modulation circuit, high-frequency phase-shifting transformer, a multi-pulse rectifying circuit, and an inverter output module, wherein each phase of bridge arm of the three-phase voltage high-frequency modulation circuit comprises n serially-connected single-phase rectifying modules and inverter modules of which the number is m times of that of the single-phase rectifying modules. Output voltage of the high-frequency distribution transformer can be adjusted by adjusting the duty cycle of the inverter modules in three-phase voltage high-frequency modulation circuit; the operation of the high-frequency phase-shifting transformer in a high-frequency modulation mode can effectively reduce the volume and weight of the whole distribution transformer; and the distribution transformer can solve the flow equalization problem of the multi-pulse rectifying circuit, allows a power factor on the line side to be close to 1 and substantially eliminates the current harmonics on the line side. The high-frequency distribution transformer is applicable to the prior power frequency power distribution system and multiphase power distribution system as well as high-frequency power distribution system such as 400Hz ship power distribution system.

The invention discloses a handheld laser drunk-driving telemetering and pre-warning system comprising a body. The body is internally provided with a DFB (Distributed Feed Back) laser and is externally provided with a laser emission button which is electrically connected with the DFB laser and a control module of the DFB laser; a receiving telescope is arranged on the side wall of the body, and a beam collimator is arranged in a lens cone of the receiving telescope; the DFB laser is connected with the beam collimator by virtue of optical fibers; and a photoelectric detector is arranged at the rear end of the receiving telescope, and the signal output of the photoelectric detector is connected with a signal acquisition and processing module. When the handheld laser drunk-driving telemetering and pre-warning system is used, emitted light beams are aligned with an area to be metered, the metering can be finished quickly by high-frequency modulation of a light source, and a user can perform judgment rapidly according to the displayed result and completely control the starting of the metering. The handheld laser drunk-driving telemetering and pre-warning system can be used for performing real-time telemetering on alcohol concentration on a small scale.

A laser diode module with a built-in high-frequency modulation IC used to remove the reflected noise generated as the laser beam reads the signal to be played back and directly packaged within a metal cap. The high-frequency modulation IC creates an electrical connection through wire bonding with several connection legs and the laser diode module. The packaged laser diode module has four connection legs. Two of these connection legs act as a positive and a negative terminal for supplying power to the built-in high-frequency modulation IC. The other two connection legs are electrically connected to an external automatic power control (APC) circuit and act as the positive terminal of the laser diode and the photo diode, respectively. In this way, the inconvenience of externally attaching a high-frequency current producing circuit board can be avoided, the productivity can be enhanced and the radiation of electromagnetic interference (EMI) can be reduced.